Teen Sport in America, Part II: Her Participation Matters provides new data that identifies the health, academic, and psychological benefits that teen girls obtain on a sport-by-sport basis. The report is an extension of the WSF’s original 2018 Teen Sport in America: Why Participation Matters that addresses the important role that sports can play in promoting positive development among teens. It offers close examination of girls’ participation across 20 sports and the health, educational, and social-psychological benefits shown to be critical for long-term healthy development. The data and recommendations that follow can be used to inform the development of policy and sport programming, to promote the importance of investing in girls’ sports.